Teething tube



FIG. 1 is a left side perspective view of a teething tube, shown my new design;

FIG. 2 is a right side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a front elevation thereof, the left, right, and back elevation views being identical thereof.

The broken lines in the drawings depict portions of the teething tube that form no part of the claimed design. The teething tube is shown with two symbolic breaks in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design. 

CLAIM I claim the ornamental design for a teething tube, as shown and described. 